Space telegraphy.



' SPACE TBLBGRAPHY." PPLIOATIOI FILED DEQ. 23.*1903. l0 IODEL.' l

PATENTEDAUG. 16, i904.

. No.L 767.993..

UNITED STATEs i PatentedAugust 16, 1904.

PATENT Ormea.

' JOHN srONnsrONE, or caminamos. MAssAOi-msnfrrs. Assienon ToA 'WiLLiAM W. swan, ,frnusrnn or innooicmnn, MAssAoirusn'rfs.

' SPACE TELEGRAPHY.

SPECIFICATION forming part oi Letters Patent No. 767,991, dated August 16, 19041:.v

Original application filed November 2li, 1903. Renewed .Tune 20, 1904. Serial-No. 213.323. Divided and this application filed December 2331903. Serial No. 186,313. (No model.) I

' 1o MU whom, llt rtwy concern:

Be it known that il, JOHN S'ronn STONE, a citizeno'f the nited States, and a resident'of Cambridge, ir thev countyuof Middlesex and State of Massachusetts, have invented a certainv new and usei'ui Improvement in Space 'lleiegraphy, or which the following is a specification.

My invention relates to thc art of transmitting intelligence from one station to another hy means of electromagnetic waves without ,y the use of wiresto guide thewaves to their destination; and 1t relates more particularly to a method of receiving signals transmitted by such waves.

This application is restricted to a method' of receiving space-telegraph signals'which may be conveniently carriedout by means'ot' the apparatusrand circuit arrangements illustrated i gare 10 of my application, Serial No.A 4;,505, filed February 8, 1900,' and upon whichlatent No. 714,756 was granted December 2, i902. In Figs. 6 and 11 of said patent lI have illustrated an clectroreccptive device vdiagralnmaticallyshown asa coherer, but

which may be any other suitable form or re-v ceivcr or wave-detector., connected in shuntcircuit to oneof the tuning elements of the resonant circuit.-,1'n Fig. 6 the tuning element is a condenser-,and in Fig. l1 the 'tuning lelement is an inductance-coil. ln Fig. l2 the electroreceptive device is itself one of the tuning elements of a resrmantcircuit. ln

Fig. l() of said patent the electrorcceptive de vice is serially connected in the closed resonant circuit, but does not 'form one of the tuning 'elements thereof, asis the case with the condenser teleplmne-receiver'shown in Fig. 12.

ln the vdrawing .vhich'accompanies and forms apart of this specilication the ligure represents dlagrammatically an arrangement of apparatus and circuits whereby the method herein described and claimed may be carried into effect.

12 is the vprimary of a transformerwhich is either connected .in series with. an elevated conductor, as shown in Fig. 6.0i' my patent aforesaid, or is included in' a closed resonant tributed inductanceoil its coils. ive absorption of .the energy of electromag- -netie waves of a-pl-edetermined frequency to or other signal-indicating device. B is a'battery.

For details oi' construction of apparatus and for the operation thereof referencer may be had to my patent hereinbcfore referred to.

W hen the elcctroreceptivo device is a coherer with contacts under light pressure, it is equivalent to a condenser, and its capacity should be made great as compared to that of the tuning-condenser for the reason more fully explained in my prior patent, No. 714,756,

in connection with thc condenserC, Fig. 6, of C, Fig. 8.

l desire to point-out that for the reasons morei'ully set forth in my 'prior patent l find it necessary, in order to effect the selective absorption of the energy of electromagnetic Waves oiA a predetermined frequency to the practical exclusion oi' the energy otwaves ot`- other frequencies. to so design the coils that the kinetic energy of the current 1n the coil shall be large compared to its potential energy ywhen the coil issupporting a currentof the.

said predetermined frequency. 1t is, further-I more, a characteristic of my invention that this selective absorption of the energy of electromagnetic waves of a predetermined frequency is accomplished solely by means ofA the closed circuit C K L L, Ina-de resonant to said frequency by the adjustment of the capacity of the ondenser to the inductance of the coil and not by -thetuning of the inductioncoil or transformer by an adjustment ot' the distributed capacity of its coils to the d is- This selectthe practical exclusionV o f the energy of like waves'ot' other frequencies, which is effected by means of the closed resonantcircuit C K L li. attuncd to saidfn'edetermincd frequency. is dueto the well-known property of a propl orly-designed resonant circuit. whereby such circuit favors the development in it of simple harmonic currents or electric oscillations of the frequency to which itis attuned by cordinating' the amplitudes of successive currents 'or electric oscillations ofsaid frequency.thereby amplifying' the currents or electric oscillations of Said frequency, and whereby it strongly opposes the development in it of' simple harmoniecurrents or electric oscillations of other frequencies, as l have pointed out in my prior patent.

lt is characteristic of my invention that the energy of the electrical oscillations developed in the elevated conductor by electromagnetic waves is transferred to the closed secondary circuit entirely by electromagnetic induction. and to this end the coils are designed so as to exclude as far as possible the displacement'- currents whiclttend to exist between adjacent turns of each winding' and between the primary and secondary windings. In this yvay and by obse1'ving'-tl1c injunctions laid do\vn in my prior patent the elect'roreceptive device will respond to electromagnetic sig'mtl-n'aves of one frequency to the exclusion of like waves of other frequencies, although the other frequenciesbe aliquot parts of the frequency to which the resonant circuit or circuits a re attuned.

An apparatus whereby the herein-described method may be carried out is claimed in my application, Serial No. 213,323, liled Novelliber 24, 1903, and renewed June 2li.' tutti.

Having described my invention. l claim 1. The method of selectively' receiving' the energy ofelectronlag'netie signal-waves of predetermined frequency. which consists 'in receiving' they same in an elevated conductor.n translating or conveying' the energy of the resulting-electric oscillations to a resonant circuit attuned to said frequency and thereby offecting' the response of an electroreccpti ve de- Vice serially connected in said resonant circuit but not forming one of the tuning' elements thereof.

2. 'lhe method of Sele -tively receiving' the, energ'y ofelectromagnetic signal-waves of predetermined frequency, which consists in re- .ceivingl the same in an elevated conductor,

thereby developing' in said elevated conductor electrical oscillations of corresponding' frequency. amplifying' Said electrical oscillations by means of a circuit whose capacity andinductance is pretletermined by said frequency and which is more responsive to electrical ososeillations ofother frequencies and thereby ell'ecting' the response of an elcctrmecept've device serially connected in said circuit but t not forming' one of the timing' elements there- (lli. 3. 'l`he method of selectively receiving' thel l of said electrical oscillations solely by m;

ing' the energyof electromagnetic waves of energy of eleetroinag'ueticsignal-waves of predetermined frequency. \\'hich consists in re ceiving the same in an elevated conductor. thereby developing in said elevated conductor electrifal oscillations of corrcsp(aiding' fre quency. translating' or conveying the enel netic induction to a circuit. atuned to sait i predetermined frequency', amplifyingl said f electrical oscdlattons by means of said circuit l and thereby elfecting'the response of an electroreceptive device serially connected in said circuit but not i"ormingone of th tuning' elements thereof.

al'. The method of receiving' the energy of simple harmonic electromag'netic .signal- \vaves. which consists in receiving the .sanne in an elevated conductor. translating' or conveying the energy of the resultin ielect rical oscillations to a resonant circuit. associated yvith said elevated conductor and :uluncd to the frequency of the electromagnetic waves the energy of which is to be received. :nnplifying' the said electrical oscillations by means of said resonant. circuit and thereby operating' an elect-roreciq)tive device serially connected in said resonantcircuit but not forming' omI of the tuning' elements thereof.

5. The method of rccei. ing' the energy of electromag'netic sig'nal\va\ es. which consistsl in receiving' the same in an elevated conductor. translatingor conveying' the energy of the resulting electrical oscillations to a circuit associated \vith said elevated conductor and having' its capacity and indnctance so correlated and adjusted that currents of greater amplitude or strength are developed in said circuit` by electromagnetic waves of one frequency than by lilv'c waves ofdillcrent frequencies and operating'. by the cnerg'y of said electrical osy cillations. an electroreceptive device serially connected in said circuit but not forming one of the timing' elements thereof.

l. 'l`hc method of receiving' the energy of electromag'netic \\'avesof one frequency' tothe exclusion ofthe energy of lilie. waves of dif ferent frequencies, which consists in absorbpredetermined frequency by an elevated conductor. thereby creating'electrical oscillations of corresponding' frequency in said elevated conductor. amplifying said electrical oscillations by means of a circuit having' its capacity and inductauce predetermined by said fre-` quency and thereby operating an electrorcceptive device serially connected in said cirm cuil but not forming' one of the tuning' elcments ilnnfeof. cillatlons of said frequency than to electrical ln testimony whereof l have hereunto suhscrihed my name thisl 22d day of December. luo.

.ltlllN ti'lUiilC t'i'iONiz. \\`itnesses:

(l. A\t r:1,.\inl-1 lliooiss. -lmixnun 'l`. rltziiuixs. 

